Shear-blade-grinding machine.



c. H HEMMING; SHEAR BLADE GRINDING-MAGfiINE. APPLIOATION FILED MAY 27, 1913.

1,097,802, Patented May 26, 1914.

3 SHEETS-SHEET 1.

WITNESSES:

fipq 06M. 7 m 7 W ATTOF iNEY COLUMBIA PLANOGRAPH COUWASHINGTOM B. e.

G. H. HEMMING.

,SHEAR BLADE GRINDING MACHINE.

APPLICATION FILBDMAY 27, 1913.

Patented Ma 26, 19m

3 SHBETS-SHBET 2.

ll) l WITNESSES: 7 OQQMJT, M 7( COLUMBIA PLANOGRAPH CO.,WASHINGTON, D. c.

C. H. HEMMING.

SHEAR BLADE GRINDING MACHINE.

APPLIOATION FILED MAYZ'I, 1913.

1,097,802, Patented May 26, 191i 3 SHEETS-SHEET 3.

WITNESSES: INVENTOR I I! WW03MZ.% B

1Q.- ATTORNEY COLUMBIA PLANOGIAFH CO" wnmncmu. DIG.

CARL HENRY HEMMING, or NEW HAVEN, conivncriour.

' SI-IEAR-IBLADE-GRINDING- MACHINE.

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Specification of Letters Patent.

Application filed May 27, 1913.

Patented May 26, 1914. Serial No. 770,137.

To all whom it may concern:

Be it known that I, CARL H. HEMMING, citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Shear- Blade-Grinding Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to shear blade grinding machines, and particularly adapted for grinding the meeting faces of shears.

Referring to the drawings: Figure 1 represents an upper plan view of the machine; Fig. 2 is a front elevation of the machine and broken view of its supporting legs looking in the direction of arrow a of Fig. 1; Fig. 3 is an end elevation of the machine looking in the direction of arrow 6, crosssectional view of the shear holder operating rod on line 00 of Fig. 1 with the support for the rod omitted; Fig. 4 is an enlarged detail view of the inside of a shear blade and broken view of its holding finger; Fig. 5 is an enlarged detail edge View of a shear blade and broken view of the grinding wheel, showing the position of the wheel at the commencement of the initial cutting operation; and Fig. 6 is an enlarged detail edge view of a shear blade showing the completion of the initial cut somewhat exaggerated.

The frame for supporting the shear blade actuating mechanism comprises the base plate 1 adjustably secured to the machine bed 2 by the bolts 3, so that the frame can be set at the proper angle to bring the in cline face of the grinding wheel 4 parallel with the inside face of the shear blade 5, as shown at Fig. 5. The standards 6 and 7 are integral with the plate or base 1 and support the rotatable and longitudinally operating rod 8. To this rod is secured a bracket or other like support comprising the base 9 and the forked uprights 10 which support the shear blade holder comprising the plate 11 having the cars 12, which ears are pivotally connected with the uprights of the bracket and also the plate 13 which is secured to the plate 11, the shear blade 5 resting against the raised portion 14 of the plate 18. The rod 8 is actuated back and forth by the handle lever 15 having its lower end pivoted to the bracket 16 secured to the standard 7. This lever is operatively connected to the rod by the link 17 and to the collar 18 secured to the rod in such a mannor as to prevent longitudinal movement and yet permit the rod to turn within it. The rod is rotated in its supports by means of the handle 19 to carry the shear blade holder toward and away from the grinding wheel. The shear blade is located on the holder by means of the finger 20 pivotally supported on the arm 21 secured to the plate 13, and is held in contact with the shear blade by the spring 22. 23 is another arm secured to plate 13 which rests on the inclined bar 24 Or track when the shear blade is against the grinding wheel. This bar is pivo-tally supported on the rod 25 vertically adjustable in the standard 26 secured to the machine bed. The proper angle of the bar 24 is maintained by means of the adjusting screws 27.

The grinding wheel is mounted on the shaft 28 journaled in the standards 29 of the slide 30. This slide is held in workable relation with the bed in the usual manner by means of the gibs 31 and the adjusting screws 32.

33 is the pulley for rotating the shaft in the usual manner.

The springs 84 bearing against the inner end of the slide 30 effects a yielding contact or engagement of the grinding wheel with the shear blade. The proper tension of these springs is regulated and the slide adjusted with respect to the shear blade by means of the screw 35 mounted in the bracket 36 at the rear of the machine.

The collar 37 is adjusted on the rod 8 with respect to the standard 7 to represent the extreme inward position of the rod, and the collar 38 limits the outward movement of the rod when brought against said standard. In operating the machine, the rod is turned by means of the handle 19 to bring the shear blade holder in position with respect to the grinding wheel and the arm 23 against the incline bar 24 and held there firmly during the gripping operation. The rod is moved by the handle 15 to bring the collar 37 against the standard 7. This will bring the shoulder of the shear blade close to the edge of the grinding wheel as shown at Fig. 5. The first operation is to grind the space around the rivet or screw hole 39, F 4, from the dotted line a to the finger 20 slightly concave as shown at (Z,

Fig. 6. The object of this concave-which as before mentioned, is somewhat exaggerated in this view-is, when the blades are fastened together by screw or rivet, to spring the blades inward at that point so .as to maintain the cutting edges of the blades in shearing engagement with each other. This concave grind is effected by means of the roll 40 carried by the adjustable collar 41 on the shaft 8, and the incline c of the bar 42 adjustably mounted in the arm as secured to the standard 6. As the rod 8 is drawn back the roll will follow down the incline and allow the shear blade to be brought closer to the grinding wheel by the continuous pressure exerted by the handle 19. While the roll is being moved down this incline by the outward movement of the rod 8, the arm 23 is being moved up the incline bar 24 causing the shear blade holder to turn slightly on its pivotal support and against the pressure of the spring 14, located between the slotted projection 45 of the shear blade holder, and the bottom of the shear blade holder bracket carrying the stud 46. This travel of the arm 23 up the incline bar 24: will cause the inside or cutting face of the shear blade to be ground tapering from the cutting edge f to the lower edge 9 so as to give the proper amount of clearance when the blades are put together.

As it is not advisable to bring the extreme point of the shear blade past the grinding wheel for fear of rounding the point, the collar 38 is adjusted on the rod 8 to strike the standard 7 and prevent this. When the blade is ground, the rod is turned to throw the shear blade holder away from the grind ing wheel. What little space of the shear blade is covered by the thin point of the locating finger 20 is afterward finished by hand.

I claim 1. A shear blade grinding machine com prising a rotatably supported grinding wheel, a supported frame adjustably secured in the proper position relative to the grinding wheel and a shear blade, an operating rod mounted in the frame and having a longitudinal and rotatable movement therein, a bracket mounted on the rod and a shear blade holder pivotally supported to the bracket.

2. A shear blade grinding machine comprising a rotatably supported grinding wheel, a shear blade holder, a shear blade holder operating rod supporting said holder, a support in which said rod has both a 10ngitudinal and a rotary movement, means substantially as shown whereby the holder is brought closer to the wheel than is re quired to grind the meeting face of the blade so as to grind the surface around the rivet hole of the blade and below the meeting surface of said blade.

3. A shear blade grinding machine comprising a rotatably supported grinding wheel, a shear blade holder, a shear blade holder operating rod to which the holder is pivotally supported, a track adjacent to the holder, means :for connecting the holder with the track so that when the rod is longitudinally actuated said holder will turn on its pivoted support, a stationary incline and means for engaging the rod therewith and adapted thereby to grind a depression in the surface about the rivet hole of the blade and below the meeting face of said blade, and by the engagement of the blade holder with the track to give a grinding clearance to the meeting face of the blade after said depression has been formed.

4. A shear blade grinding machine comprising a grinding wheel, a shear blade holder, a shear blade holder operating rod on which the holder is pivotally supported, a support for the rod in which said rod is adapted to have both a longitudinal and rotary movement, a blade holder supporting track adjacent to the holder with which said holder is held under spring pressure durin the grinding operation.

0. A shear blade grinding machine comprising a longitudinally movable support ad justably maintained under spring tension, a shaft carrying a grinding wheel journaled in said support, a blade holder, a holder actuating rod with which the holder is pivotally connected, a support for the rod, said rod adapted to have both a longitudinal and rotatable movement therein, a blade holder supporting track against which the holder is maintained under spring tension during the grinding operation.

In testimony whereof I affix my signa ture in presence of two witnesses.

CARL HENRY HEMMING Witnesses:

FnnnK. H. BECKWITH, HARRY Gr. HEDIN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

